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It works perfect for me! Thanks for quick fixing :)

Another question,
Before, when setting symbol in makrLine, two symbols with different directions will be created as shown below

now the symbols will point to the same direction as shown below

Just wonder is this expected?

@YiYingWu1302 Could you provide an example?

@plainheart I set symbol in makrLine instead of markLine.data

markLine: {
  symbol: 'triangle'
}

THX! That's not expected. I've made a fix for it, now it should work well. A default rotation action would be performed if symbolRotate is not specified(undefined or null) or NaN. You can refer to this commit f949aeb for more details.

It works well!
Just come up with an idea, since symbol supports Array as value, to set fromSymboland toSymbol, is it possible Array is also supported for symbolRotate to set fromSymbol & toSymbol's rotation?
Like below

markLine: {
  symbol: 'triangle',
  symbolRotate: [0, 180]
}

@YiYingWu1302 That's OK, but we may have to wait until this PR is merged since current PR is for fixing. After it is merged, you can open a feature request issue for these requirements. BTW, sorry for late reply. :）

@plainheart I get it. Thanks for your kindly reply!

It works well!
Just come up with an idea, since symbol supports Array as value, to set fromSymboland toSymbol, is it possible Array is also supported for symbolRotate to set fromSymbol & toSymbol's rotation?
Like below

markLine: {
  symbol: 'triangle',
  symbolRotate: [0, 180]
}

Hi~ @YiYingWu1302 I've made some commits for this feature you mentioned about two months ago.
Please feel free to see #12736 for details.